I made the boss for our level. its around 2k Tris, and has a 512 diffuse.
I also made a low poly car for our city. These were very low poly, as the player is flying above the city, and there needed to be lots of cars.
Here are some of the buildings I made. I used a single texture sheet.
The texture Sheet I made.
Here is a video of my groups final level, I also did the level design and pathing for the player and enemies.